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190 papers · 1 filter

math.AP1999

Null form estimates for (1/2,1/2) symbols and local existence for a quasilinear Dirichlet-wave equation

Hart Smith, Christopher D. Sogge

The authors show that bilinear estimates for null forms hold for Dirichlet-wave equations outside of convex obstacle. This generalizes results for the Euclidean case of Klainerman…

math.CA1999

Averages over curves with torsion

Daniel Oberlin, Hart Smith, Christopher D. Sogge

We establish Sobolev mapping properties for averages over certain curves in , which improve upon the estimates obtained by interpolation.

math.CA1999

Concerning Nikodym-type sets in 3-dimensional curved spaces

Christopher D. Sogge

We obtain estimates for maximal functions that arise when one studies Nikodym-type sets. We also formulate a curvature condition that allows favorable estimates for these maximal f…

hep-ex1999★ 67 cited

Precise measurement of the b-quark fragmentation function in Z0 boson decays

The SLD Collaboration, Kenji Abe

We have developed a new technique for inclusive reconstruction of the energy of B hadrons. The excellent efficiency and resolution of this technique allow us to make the most preci…

astro-ph1999★ 1 cited

The Evolution of the Interstellar Medium Around Young Stellar Clusters

D. Calzetti, C. A. Tremonti, T. M. Heckman +1

The interplay between the ISM and the massive stars formed in clusters and, more generally, in recent events of star formation is reviewed via the global effects each has on the ot…

hep-ph1999★ 46 cited

Strong phases and D0-anti-D0 mixing parameters

Adam F. Falk, Yosef Nir, Alexey A. Petrov

We argue that there could be large, SU(3) violating resonance contributions to D -> K pi decays which would affect the extraction of the D0-anti-D0 mixing parameters from experimen…

astro-ph1999★ 18 cited

The Ionization Source in the Nucleus of M84

G. A. Bower, R. F. Green, A. C. Quillen +9

We have obtained new Hubble Space Telescope (HST) observations of M84, a nearby massive elliptical galaxy whose nucleus contains a 1.5 X 10^9 Msun dark compact object, which presum…

astro-ph1999★ 26 cited

Background and Scattered Light Subtraction in the High-Resolution Echelle Modes of the Space Telescope Imaging Spectrograph

J. Christopher Howk, Kenneth R. Sembach

We present a simple, effective approach for estimating the on-order backgrounds of spectra taken with the highest-resolution modes of the Space Telescope Imaging Spectrograph (STIS…

astro-ph1999★ 1 cited

The Sloan Digital Sky Survey and its Archive

Alexander S. Szalay, Peter Kunszt, Anirudha Thakar +2

The next-generation astronomy archives will cover most of the universe at fine resolution in many wavelengths. One of the first of these projects, the Sloan Digital Sky Survey (SDS…

astro-ph1999★ 1 cited

The ROSAT Deep Cluster Survey: Constraints on Cosmology

S. Borgani, P. Rosati, R. Della Ceca +2

We use the ROSAT Deep Cluster Survey (RDCS) to trace the evolution of the cluster abundance out to and constrain cosmological models. We resort to a phenomenological…

astro-ph1999★ 19 cited

X-raying the Star Formation History of the Universe

A. Cavaliere, R. Giacconi, N. Menci

The current models of early star and galaxy formation are based upon the hierarchical growth of dark matter halos, within which the baryons condense into stars after cooling down f…

astro-ph1999★ 58 cited

Infrared Spectroscopy of a Massive Obscured Star Cluster in the Antennae Galaxies (NGC 4038/4039) with NIRSPEC

A. M. Gilbert, J. R. Graham, I. S. McLean +6

We present infrared spectroscopy of the Antennae Galaxies (NGC 4038/4039) with NIRSPEC at the W. M. Keck Observatory. We imaged the star clusters in the vicinity of the southern nu…

astro-ph1999★ 67 cited

Stagnation and Infall of Dense Clumps in the Stellar Wind of tau Scorpii

J. Christopher Howk, Joseph Cassinelli, Jon Bjorkman +1

Observations of the B0.2V star tau Scorpii have revealed unusual stellar wind characteristics: red-shifted absorption in the far-ultraviolet O VI resonance doublet up to +250 km/s,…

astro-ph1999★ 51 cited

Statistics of Weak Lensing at Small Angular Scales: Analytical Predictions for Lower Order Moments

Dipak Munshi, Bhuvnesh Jain

Weak lensing surveys are expected to provide direct measurements of the statistics of the projected dark matter distribution. Most analytical studies of weak lensing statistics hav…

astro-ph1999★ 139 cited

Kretschmann Scalar for a Kerr-Newman Black Hole

Richard C. Henry

I have derived the Kretschmann scalar for a general black hole of mass m, angular momentum per unit mass a, and electric charge Q. The Kretschmann scalar gives the amount of curvat…

hep-ex1999

Precision Electroweak Physics at the Z

Morris L. Swartz

A review of the decade of Z-pole electroweak physics is presented. Although all experimental work has been completed, it represents a ``Golden Age'' in our understanding of the Min…

astro-ph1999★ 75 cited

Intensive HST, RXTE and ASCA Monitoring of NGC 3516: Evidence Against Thermal Reprocessing

Rick Edelson, Anuradha Koratkar, Kirpal Nandra +10

During 1998 April 13-16, NGC 3516 was monitored almost continuously with HST for 10.3 hr in the UV and 2.8 d in the optical, and simultaneous RXTE and ASCA monitoring covered the s…

astro-ph1999★ 1.1k cited

Viewing the Shadow of the Black Hole at the Galactic Center

Heino Falcke, Fulvio Melia, Eric Agol

In recent years, the evidence for the existence of an ultra-compact concentration of dark mass associated with the radio source Sgr A* in the Galactic Center has become very strong…

astro-ph1999★ 358 cited

The FIRST Bright Quasar Survey. II. 60 Nights and 1200 Spectra Later

R. L. White, R. H. Becker, M. D. Gregg +11

We have used the VLA FIRST survey and the APM catalog of the POSS-I plates as the basis for constructing a new radio-selected sample of optically bright quasars. This is the first…

astro-ph1999★ 53 cited

A High Signal-to-Noise UV Spectrum of NGC 7469: New Support for Reprocessing of Continuum Radiation

Gerard A. Kriss, Bradley M. Peterson, D. Michael Crenshaw +1

From 1996 June 10 to 1996 July 29 the International AGN Watch monitored the Seyfert 1 galaxy NGC 7469 using IUE, RXTE, and a network of ground-based observatories. On 1996 June 18,…

astro-ph1999

The Virtues of X-ray Clusters and the Entropy of Cosmic Baryons

Paolo Tozzi, Colin Norman

The thermodynamics of the diffuse, X-ray emitting gas in clusters and groups of galaxies are affected by a certain amount of non-gravitational energy input, as indicated by the sca…

astro-ph1999★ 50 cited

The Hubble Deep Field South - STIS Imaging

J. P. Gardner, S. A. Baum, T. M. Brown +18

We present the imaging observations made with the Space Telescope Imaging Spectrograph of the Hubble Deep Field - South. The field was imaged in 4 bandpasses: a clear CCD bandpass…

math.AG1999★ 13 cited

The first main theorem on complements: from global to local

Yu. G. Prokhorov, V. V. Shokurov

The aim of this paper is to clarify and generalize techniques of works alg-geom/9711024 (see also math.AG/9810097 and math.AG/9901004). Roughly speaking, we prove that for local Fa…

hep-th1999★ 3 cited

Partial Supersymmetry Breaking from Five Dimensions

Richard Altendorfer

Theories of partial supersymmetry breaking N=2 -> N=1 in four dimensions are derived by coupling the N=2 massless gravitino multiplet to N=2 supergravity in five dimensions and per…